1 // SPDX-License-Identifier: GPL-2.0-only
3 * Kernel-based Virtual Machine driver for Linux
5 * This module enables machines with Intel VT-x extensions to run virtual
6 * machines without emulation or binary translation.
8 * Copyright (C) 2006 Qumranet, Inc.
9 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
12 * Avi Kivity <avi@qumranet.com>
13 * Yaniv Kamay <yaniv@qumranet.com>
16 #include <kvm/iodev.h>
18 #include <linux/kvm_host.h>
19 #include <linux/kvm.h>
20 #include <linux/module.h>
21 #include <linux/errno.h>
22 #include <linux/percpu.h>
24 #include <linux/miscdevice.h>
25 #include <linux/vmalloc.h>
26 #include <linux/reboot.h>
27 #include <linux/debugfs.h>
28 #include <linux/highmem.h>
29 #include <linux/file.h>
30 #include <linux/syscore_ops.h>
31 #include <linux/cpu.h>
32 #include <linux/sched/signal.h>
33 #include <linux/sched/mm.h>
34 #include <linux/sched/stat.h>
35 #include <linux/cpumask.h>
36 #include <linux/smp.h>
37 #include <linux/anon_inodes.h>
38 #include <linux/profile.h>
39 #include <linux/kvm_para.h>
40 #include <linux/pagemap.h>
41 #include <linux/mman.h>
42 #include <linux/swap.h>
43 #include <linux/bitops.h>
44 #include <linux/spinlock.h>
45 #include <linux/compat.h>
46 #include <linux/srcu.h>
47 #include <linux/hugetlb.h>
48 #include <linux/slab.h>
49 #include <linux/sort.h>
50 #include <linux/bsearch.h>
52 #include <linux/lockdep.h>
53 #include <linux/kthread.h>
55 #include <asm/processor.h>
56 #include <asm/ioctl.h>
57 #include <linux/uaccess.h>
58 #include <asm/pgtable.h>
60 #include "coalesced_mmio.h"
64 #define CREATE_TRACE_POINTS
65 #include <trace/events/kvm.h>
67 /* Worst case buffer size needed for holding an integer. */
68 #define ITOA_MAX_LEN 12
70 MODULE_AUTHOR("Qumranet");
71 MODULE_LICENSE("GPL");
73 /* Architectures should define their poll value according to the halt latency */
74 unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT;
75 module_param(halt_poll_ns, uint, 0644);
76 EXPORT_SYMBOL_GPL(halt_poll_ns);
78 /* Default doubles per-vcpu halt_poll_ns. */
79 unsigned int halt_poll_ns_grow = 2;
80 module_param(halt_poll_ns_grow, uint, 0644);
81 EXPORT_SYMBOL_GPL(halt_poll_ns_grow);
83 /* The start value to grow halt_poll_ns from */
84 unsigned int halt_poll_ns_grow_start = 10000; /* 10us */
85 module_param(halt_poll_ns_grow_start, uint, 0644);
86 EXPORT_SYMBOL_GPL(halt_poll_ns_grow_start);
88 /* Default resets per-vcpu halt_poll_ns . */
89 unsigned int halt_poll_ns_shrink;
90 module_param(halt_poll_ns_shrink, uint, 0644);
91 EXPORT_SYMBOL_GPL(halt_poll_ns_shrink);
96 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
99 DEFINE_MUTEX(kvm_lock);
100 static DEFINE_RAW_SPINLOCK(kvm_count_lock);
103 static cpumask_var_t cpus_hardware_enabled;
104 static int kvm_usage_count;
105 static atomic_t hardware_enable_failed;
107 struct kmem_cache *kvm_vcpu_cache;
108 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
110 static __read_mostly struct preempt_ops kvm_preempt_ops;
112 struct dentry *kvm_debugfs_dir;
113 EXPORT_SYMBOL_GPL(kvm_debugfs_dir);
115 static int kvm_debugfs_num_entries;
116 static const struct file_operations *stat_fops_per_vm[];
118 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
120 #ifdef CONFIG_KVM_COMPAT
121 static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl,
123 #define KVM_COMPAT(c) .compat_ioctl = (c)
126 * For architectures that don't implement a compat infrastructure,
127 * adopt a double line of defense:
128 * - Prevent a compat task from opening /dev/kvm
129 * - If the open has been done by a 64bit task, and the KVM fd
130 * passed to a compat task, let the ioctls fail.
132 static long kvm_no_compat_ioctl(struct file *file, unsigned int ioctl,
133 unsigned long arg) { return -EINVAL; }
135 static int kvm_no_compat_open(struct inode *inode, struct file *file)
137 return is_compat_task() ? -ENODEV : 0;
139 #define KVM_COMPAT(c) .compat_ioctl = kvm_no_compat_ioctl, \
140 .open = kvm_no_compat_open
142 static int hardware_enable_all(void);
143 static void hardware_disable_all(void);
145 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
147 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn);
149 __visible bool kvm_rebooting;
150 EXPORT_SYMBOL_GPL(kvm_rebooting);
152 static bool largepages_enabled = true;
154 #define KVM_EVENT_CREATE_VM 0
155 #define KVM_EVENT_DESTROY_VM 1
156 static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm);
157 static unsigned long long kvm_createvm_count;
158 static unsigned long long kvm_active_vms;
160 __weak int kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm,
161 unsigned long start, unsigned long end, bool blockable)
166 bool kvm_is_zone_device_pfn(kvm_pfn_t pfn)
169 * The metadata used by is_zone_device_page() to determine whether or
170 * not a page is ZONE_DEVICE is guaranteed to be valid if and only if
171 * the device has been pinned, e.g. by get_user_pages(). WARN if the
172 * page_count() is zero to help detect bad usage of this helper.
174 if (!pfn_valid(pfn) || WARN_ON_ONCE(!page_count(pfn_to_page(pfn))))
177 return is_zone_device_page(pfn_to_page(pfn));
180 bool kvm_is_reserved_pfn(kvm_pfn_t pfn)
183 * ZONE_DEVICE pages currently set PG_reserved, but from a refcounting
184 * perspective they are "normal" pages, albeit with slightly different
188 return PageReserved(pfn_to_page(pfn)) &&
189 !kvm_is_zone_device_pfn(pfn);
195 * Switches to specified vcpu, until a matching vcpu_put()
197 void vcpu_load(struct kvm_vcpu *vcpu)
200 preempt_notifier_register(&vcpu->preempt_notifier);
201 kvm_arch_vcpu_load(vcpu, cpu);
204 EXPORT_SYMBOL_GPL(vcpu_load);
206 void vcpu_put(struct kvm_vcpu *vcpu)
209 kvm_arch_vcpu_put(vcpu);
210 preempt_notifier_unregister(&vcpu->preempt_notifier);
213 EXPORT_SYMBOL_GPL(vcpu_put);
215 /* TODO: merge with kvm_arch_vcpu_should_kick */
216 static bool kvm_request_needs_ipi(struct kvm_vcpu *vcpu, unsigned req)
218 int mode = kvm_vcpu_exiting_guest_mode(vcpu);
221 * We need to wait for the VCPU to reenable interrupts and get out of
222 * READING_SHADOW_PAGE_TABLES mode.
224 if (req & KVM_REQUEST_WAIT)
225 return mode != OUTSIDE_GUEST_MODE;
228 * Need to kick a running VCPU, but otherwise there is nothing to do.
230 return mode == IN_GUEST_MODE;
233 static void ack_flush(void *_completed)
237 static inline bool kvm_kick_many_cpus(const struct cpumask *cpus, bool wait)
240 cpus = cpu_online_mask;
242 if (cpumask_empty(cpus))
245 smp_call_function_many(cpus, ack_flush, NULL, wait);
249 bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
250 unsigned long *vcpu_bitmap, cpumask_var_t tmp)
253 struct kvm_vcpu *vcpu;
258 kvm_for_each_vcpu(i, vcpu, kvm) {
259 if (vcpu_bitmap && !test_bit(i, vcpu_bitmap))
262 kvm_make_request(req, vcpu);
265 if (!(req & KVM_REQUEST_NO_WAKEUP) && kvm_vcpu_wake_up(vcpu))
268 if (tmp != NULL && cpu != -1 && cpu != me &&
269 kvm_request_needs_ipi(vcpu, req))
270 __cpumask_set_cpu(cpu, tmp);
273 called = kvm_kick_many_cpus(tmp, !!(req & KVM_REQUEST_WAIT));
279 bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
284 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
286 called = kvm_make_vcpus_request_mask(kvm, req, NULL, cpus);
288 free_cpumask_var(cpus);
292 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
293 void kvm_flush_remote_tlbs(struct kvm *kvm)
296 * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in
297 * kvm_make_all_cpus_request.
299 long dirty_count = smp_load_acquire(&kvm->tlbs_dirty);
302 * We want to publish modifications to the page tables before reading
303 * mode. Pairs with a memory barrier in arch-specific code.
304 * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest
305 * and smp_mb in walk_shadow_page_lockless_begin/end.
306 * - powerpc: smp_mb in kvmppc_prepare_to_enter.
308 * There is already an smp_mb__after_atomic() before
309 * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that
312 if (!kvm_arch_flush_remote_tlb(kvm)
313 || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
314 ++kvm->stat.remote_tlb_flush;
315 cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
317 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
320 void kvm_reload_remote_mmus(struct kvm *kvm)
322 kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
325 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
330 mutex_init(&vcpu->mutex);
335 init_swait_queue_head(&vcpu->wq);
336 kvm_async_pf_vcpu_init(vcpu);
339 INIT_LIST_HEAD(&vcpu->blocked_vcpu_list);
341 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
346 vcpu->run = page_address(page);
348 kvm_vcpu_set_in_spin_loop(vcpu, false);
349 kvm_vcpu_set_dy_eligible(vcpu, false);
350 vcpu->preempted = false;
353 r = kvm_arch_vcpu_init(vcpu);
359 free_page((unsigned long)vcpu->run);
363 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
365 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
368 * no need for rcu_read_lock as VCPU_RUN is the only place that
369 * will change the vcpu->pid pointer and on uninit all file
370 * descriptors are already gone.
372 put_pid(rcu_dereference_protected(vcpu->pid, 1));
373 kvm_arch_vcpu_uninit(vcpu);
374 free_page((unsigned long)vcpu->run);
376 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
378 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
379 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
381 return container_of(mn, struct kvm, mmu_notifier);
384 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
385 struct mm_struct *mm,
386 unsigned long address,
389 struct kvm *kvm = mmu_notifier_to_kvm(mn);
392 idx = srcu_read_lock(&kvm->srcu);
393 spin_lock(&kvm->mmu_lock);
394 kvm->mmu_notifier_seq++;
396 if (kvm_set_spte_hva(kvm, address, pte))
397 kvm_flush_remote_tlbs(kvm);
399 spin_unlock(&kvm->mmu_lock);
400 srcu_read_unlock(&kvm->srcu, idx);
403 static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
404 const struct mmu_notifier_range *range)
406 struct kvm *kvm = mmu_notifier_to_kvm(mn);
407 int need_tlb_flush = 0, idx;
410 idx = srcu_read_lock(&kvm->srcu);
411 spin_lock(&kvm->mmu_lock);
413 * The count increase must become visible at unlock time as no
414 * spte can be established without taking the mmu_lock and
415 * count is also read inside the mmu_lock critical section.
417 kvm->mmu_notifier_count++;
418 need_tlb_flush = kvm_unmap_hva_range(kvm, range->start, range->end);
419 need_tlb_flush |= kvm->tlbs_dirty;
420 /* we've to flush the tlb before the pages can be freed */
422 kvm_flush_remote_tlbs(kvm);
424 spin_unlock(&kvm->mmu_lock);
426 ret = kvm_arch_mmu_notifier_invalidate_range(kvm, range->start,
428 mmu_notifier_range_blockable(range));
430 srcu_read_unlock(&kvm->srcu, idx);
435 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
436 const struct mmu_notifier_range *range)
438 struct kvm *kvm = mmu_notifier_to_kvm(mn);
440 spin_lock(&kvm->mmu_lock);
442 * This sequence increase will notify the kvm page fault that
443 * the page that is going to be mapped in the spte could have
446 kvm->mmu_notifier_seq++;
449 * The above sequence increase must be visible before the
450 * below count decrease, which is ensured by the smp_wmb above
451 * in conjunction with the smp_rmb in mmu_notifier_retry().
453 kvm->mmu_notifier_count--;
454 spin_unlock(&kvm->mmu_lock);
456 BUG_ON(kvm->mmu_notifier_count < 0);
459 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
460 struct mm_struct *mm,
464 struct kvm *kvm = mmu_notifier_to_kvm(mn);
467 idx = srcu_read_lock(&kvm->srcu);
468 spin_lock(&kvm->mmu_lock);
470 young = kvm_age_hva(kvm, start, end);
472 kvm_flush_remote_tlbs(kvm);
474 spin_unlock(&kvm->mmu_lock);
475 srcu_read_unlock(&kvm->srcu, idx);
480 static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn,
481 struct mm_struct *mm,
485 struct kvm *kvm = mmu_notifier_to_kvm(mn);
488 idx = srcu_read_lock(&kvm->srcu);
489 spin_lock(&kvm->mmu_lock);
491 * Even though we do not flush TLB, this will still adversely
492 * affect performance on pre-Haswell Intel EPT, where there is
493 * no EPT Access Bit to clear so that we have to tear down EPT
494 * tables instead. If we find this unacceptable, we can always
495 * add a parameter to kvm_age_hva so that it effectively doesn't
496 * do anything on clear_young.
498 * Also note that currently we never issue secondary TLB flushes
499 * from clear_young, leaving this job up to the regular system
500 * cadence. If we find this inaccurate, we might come up with a
501 * more sophisticated heuristic later.
503 young = kvm_age_hva(kvm, start, end);
504 spin_unlock(&kvm->mmu_lock);
505 srcu_read_unlock(&kvm->srcu, idx);
510 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
511 struct mm_struct *mm,
512 unsigned long address)
514 struct kvm *kvm = mmu_notifier_to_kvm(mn);
517 idx = srcu_read_lock(&kvm->srcu);
518 spin_lock(&kvm->mmu_lock);
519 young = kvm_test_age_hva(kvm, address);
520 spin_unlock(&kvm->mmu_lock);
521 srcu_read_unlock(&kvm->srcu, idx);
526 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
527 struct mm_struct *mm)
529 struct kvm *kvm = mmu_notifier_to_kvm(mn);
532 idx = srcu_read_lock(&kvm->srcu);
533 kvm_arch_flush_shadow_all(kvm);
534 srcu_read_unlock(&kvm->srcu, idx);
537 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
538 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
539 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
540 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
541 .clear_young = kvm_mmu_notifier_clear_young,
542 .test_young = kvm_mmu_notifier_test_young,
543 .change_pte = kvm_mmu_notifier_change_pte,
544 .release = kvm_mmu_notifier_release,
547 static int kvm_init_mmu_notifier(struct kvm *kvm)
549 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
550 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
553 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
555 static int kvm_init_mmu_notifier(struct kvm *kvm)
560 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
562 static struct kvm_memslots *kvm_alloc_memslots(void)
565 struct kvm_memslots *slots;
567 slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL_ACCOUNT);
571 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
572 slots->id_to_index[i] = slots->memslots[i].id = i;
577 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
579 if (!memslot->dirty_bitmap)
582 kvfree(memslot->dirty_bitmap);
583 memslot->dirty_bitmap = NULL;
587 * Free any memory in @free but not in @dont.
589 static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
590 struct kvm_memory_slot *dont)
592 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
593 kvm_destroy_dirty_bitmap(free);
595 kvm_arch_free_memslot(kvm, free, dont);
600 static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
602 struct kvm_memory_slot *memslot;
607 kvm_for_each_memslot(memslot, slots)
608 kvm_free_memslot(kvm, memslot, NULL);
613 static void kvm_destroy_vm_debugfs(struct kvm *kvm)
617 if (!kvm->debugfs_dentry)
620 debugfs_remove_recursive(kvm->debugfs_dentry);
622 if (kvm->debugfs_stat_data) {
623 for (i = 0; i < kvm_debugfs_num_entries; i++)
624 kfree(kvm->debugfs_stat_data[i]);
625 kfree(kvm->debugfs_stat_data);
629 static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
631 char dir_name[ITOA_MAX_LEN * 2];
632 struct kvm_stat_data *stat_data;
633 struct kvm_stats_debugfs_item *p;
635 if (!debugfs_initialized())
638 snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd);
639 kvm->debugfs_dentry = debugfs_create_dir(dir_name, kvm_debugfs_dir);
641 kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries,
642 sizeof(*kvm->debugfs_stat_data),
644 if (!kvm->debugfs_stat_data)
647 for (p = debugfs_entries; p->name; p++) {
648 stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL_ACCOUNT);
652 stat_data->kvm = kvm;
653 stat_data->offset = p->offset;
654 stat_data->mode = p->mode ? p->mode : 0644;
655 kvm->debugfs_stat_data[p - debugfs_entries] = stat_data;
656 debugfs_create_file(p->name, stat_data->mode, kvm->debugfs_dentry,
657 stat_data, stat_fops_per_vm[p->kind]);
663 * Called after the VM is otherwise initialized, but just before adding it to
666 int __weak kvm_arch_post_init_vm(struct kvm *kvm)
672 * Called just after removing the VM from the vm_list, but before doing any
675 void __weak kvm_arch_pre_destroy_vm(struct kvm *kvm)
679 static struct kvm *kvm_create_vm(unsigned long type)
681 struct kvm *kvm = kvm_arch_alloc_vm();
686 return ERR_PTR(-ENOMEM);
688 spin_lock_init(&kvm->mmu_lock);
690 kvm->mm = current->mm;
691 kvm_eventfd_init(kvm);
692 mutex_init(&kvm->lock);
693 mutex_init(&kvm->irq_lock);
694 mutex_init(&kvm->slots_lock);
695 INIT_LIST_HEAD(&kvm->devices);
697 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
699 if (init_srcu_struct(&kvm->srcu))
700 goto out_err_no_srcu;
701 if (init_srcu_struct(&kvm->irq_srcu))
702 goto out_err_no_irq_srcu;
704 refcount_set(&kvm->users_count, 1);
705 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
706 struct kvm_memslots *slots = kvm_alloc_memslots();
709 goto out_err_no_arch_destroy_vm;
710 /* Generations must be different for each address space. */
711 slots->generation = i;
712 rcu_assign_pointer(kvm->memslots[i], slots);
715 for (i = 0; i < KVM_NR_BUSES; i++) {
716 rcu_assign_pointer(kvm->buses[i],
717 kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL_ACCOUNT));
719 goto out_err_no_arch_destroy_vm;
722 r = kvm_arch_init_vm(kvm, type);
724 goto out_err_no_arch_destroy_vm;
726 r = hardware_enable_all();
728 goto out_err_no_disable;
730 #ifdef CONFIG_HAVE_KVM_IRQFD
731 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
734 r = kvm_init_mmu_notifier(kvm);
736 goto out_err_no_mmu_notifier;
738 r = kvm_arch_post_init_vm(kvm);
742 mutex_lock(&kvm_lock);
743 list_add(&kvm->vm_list, &vm_list);
744 mutex_unlock(&kvm_lock);
746 preempt_notifier_inc();
751 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
752 if (kvm->mmu_notifier.ops)
753 mmu_notifier_unregister(&kvm->mmu_notifier, current->mm);
755 out_err_no_mmu_notifier:
756 hardware_disable_all();
758 kvm_arch_destroy_vm(kvm);
759 out_err_no_arch_destroy_vm:
760 WARN_ON_ONCE(!refcount_dec_and_test(&kvm->users_count));
761 for (i = 0; i < KVM_NR_BUSES; i++)
762 kfree(kvm_get_bus(kvm, i));
763 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
764 kvm_free_memslots(kvm, __kvm_memslots(kvm, i));
765 cleanup_srcu_struct(&kvm->irq_srcu);
767 cleanup_srcu_struct(&kvm->srcu);
769 kvm_arch_free_vm(kvm);
774 static void kvm_destroy_devices(struct kvm *kvm)
776 struct kvm_device *dev, *tmp;
779 * We do not need to take the kvm->lock here, because nobody else
780 * has a reference to the struct kvm at this point and therefore
781 * cannot access the devices list anyhow.
783 list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) {
784 list_del(&dev->vm_node);
785 dev->ops->destroy(dev);
789 static void kvm_destroy_vm(struct kvm *kvm)
792 struct mm_struct *mm = kvm->mm;
794 kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm);
795 kvm_destroy_vm_debugfs(kvm);
796 kvm_arch_sync_events(kvm);
797 mutex_lock(&kvm_lock);
798 list_del(&kvm->vm_list);
799 mutex_unlock(&kvm_lock);
800 kvm_arch_pre_destroy_vm(kvm);
802 kvm_free_irq_routing(kvm);
803 for (i = 0; i < KVM_NR_BUSES; i++) {
804 struct kvm_io_bus *bus = kvm_get_bus(kvm, i);
807 kvm_io_bus_destroy(bus);
808 kvm->buses[i] = NULL;
810 kvm_coalesced_mmio_free(kvm);
811 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
812 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
814 kvm_arch_flush_shadow_all(kvm);
816 kvm_arch_destroy_vm(kvm);
817 kvm_destroy_devices(kvm);
818 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
819 kvm_free_memslots(kvm, __kvm_memslots(kvm, i));
820 cleanup_srcu_struct(&kvm->irq_srcu);
821 cleanup_srcu_struct(&kvm->srcu);
822 kvm_arch_free_vm(kvm);
823 preempt_notifier_dec();
824 hardware_disable_all();
828 void kvm_get_kvm(struct kvm *kvm)
830 refcount_inc(&kvm->users_count);
832 EXPORT_SYMBOL_GPL(kvm_get_kvm);
834 void kvm_put_kvm(struct kvm *kvm)
836 if (refcount_dec_and_test(&kvm->users_count))
839 EXPORT_SYMBOL_GPL(kvm_put_kvm);
842 static int kvm_vm_release(struct inode *inode, struct file *filp)
844 struct kvm *kvm = filp->private_data;
846 kvm_irqfd_release(kvm);
853 * Allocation size is twice as large as the actual dirty bitmap size.
854 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
856 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
858 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
860 memslot->dirty_bitmap = kvzalloc(dirty_bytes, GFP_KERNEL_ACCOUNT);
861 if (!memslot->dirty_bitmap)
868 * Insert memslot and re-sort memslots based on their GFN,
869 * so binary search could be used to lookup GFN.
870 * Sorting algorithm takes advantage of having initially
871 * sorted array and known changed memslot position.
873 static void update_memslots(struct kvm_memslots *slots,
874 struct kvm_memory_slot *new,
875 enum kvm_mr_change change)
878 int i = slots->id_to_index[id];
879 struct kvm_memory_slot *mslots = slots->memslots;
881 WARN_ON(mslots[i].id != id);
885 WARN_ON(mslots[i].npages || !new->npages);
889 WARN_ON(new->npages || !mslots[i].npages);
895 while (i < KVM_MEM_SLOTS_NUM - 1 &&
896 new->base_gfn <= mslots[i + 1].base_gfn) {
897 if (!mslots[i + 1].npages)
899 mslots[i] = mslots[i + 1];
900 slots->id_to_index[mslots[i].id] = i;
905 * The ">=" is needed when creating a slot with base_gfn == 0,
906 * so that it moves before all those with base_gfn == npages == 0.
908 * On the other hand, if new->npages is zero, the above loop has
909 * already left i pointing to the beginning of the empty part of
910 * mslots, and the ">=" would move the hole backwards in this
911 * case---which is wrong. So skip the loop when deleting a slot.
915 new->base_gfn >= mslots[i - 1].base_gfn) {
916 mslots[i] = mslots[i - 1];
917 slots->id_to_index[mslots[i].id] = i;
921 WARN_ON_ONCE(i != slots->used_slots);
924 slots->id_to_index[mslots[i].id] = i;
927 static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem)
929 u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
931 #ifdef __KVM_HAVE_READONLY_MEM
932 valid_flags |= KVM_MEM_READONLY;
935 if (mem->flags & ~valid_flags)
941 static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
942 int as_id, struct kvm_memslots *slots)
944 struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id);
945 u64 gen = old_memslots->generation;
947 WARN_ON(gen & KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS);
948 slots->generation = gen | KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS;
950 rcu_assign_pointer(kvm->memslots[as_id], slots);
951 synchronize_srcu_expedited(&kvm->srcu);
954 * Increment the new memslot generation a second time, dropping the
955 * update in-progress flag and incrementing then generation based on
956 * the number of address spaces. This provides a unique and easily
957 * identifiable generation number while the memslots are in flux.
959 gen = slots->generation & ~KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS;
962 * Generations must be unique even across address spaces. We do not need
963 * a global counter for that, instead the generation space is evenly split
964 * across address spaces. For example, with two address spaces, address
965 * space 0 will use generations 0, 2, 4, ... while address space 1 will
966 * use generations 1, 3, 5, ...
968 gen += KVM_ADDRESS_SPACE_NUM;
970 kvm_arch_memslots_updated(kvm, gen);
972 slots->generation = gen;
978 * Allocate some memory and give it an address in the guest physical address
981 * Discontiguous memory is allowed, mostly for framebuffers.
983 * Must be called holding kvm->slots_lock for write.
985 int __kvm_set_memory_region(struct kvm *kvm,
986 const struct kvm_userspace_memory_region *mem)
990 unsigned long npages;
991 struct kvm_memory_slot *slot;
992 struct kvm_memory_slot old, new;
993 struct kvm_memslots *slots = NULL, *old_memslots;
995 enum kvm_mr_change change;
997 r = check_memory_region_flags(mem);
1002 as_id = mem->slot >> 16;
1003 id = (u16)mem->slot;
1005 /* General sanity checks */
1006 if (mem->memory_size & (PAGE_SIZE - 1))
1008 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
1010 /* We can read the guest memory with __xxx_user() later on. */
1011 if ((id < KVM_USER_MEM_SLOTS) &&
1012 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
1013 !access_ok((void __user *)(unsigned long)mem->userspace_addr,
1016 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM)
1018 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
1021 slot = id_to_memslot(__kvm_memslots(kvm, as_id), id);
1022 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
1023 npages = mem->memory_size >> PAGE_SHIFT;
1025 if (npages > KVM_MEM_MAX_NR_PAGES)
1031 new.base_gfn = base_gfn;
1032 new.npages = npages;
1033 new.flags = mem->flags;
1037 change = KVM_MR_CREATE;
1038 else { /* Modify an existing slot. */
1039 if ((mem->userspace_addr != old.userspace_addr) ||
1040 (npages != old.npages) ||
1041 ((new.flags ^ old.flags) & KVM_MEM_READONLY))
1044 if (base_gfn != old.base_gfn)
1045 change = KVM_MR_MOVE;
1046 else if (new.flags != old.flags)
1047 change = KVM_MR_FLAGS_ONLY;
1048 else { /* Nothing to change. */
1057 change = KVM_MR_DELETE;
1062 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
1063 /* Check for overlaps */
1065 kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) {
1068 if (!((base_gfn + npages <= slot->base_gfn) ||
1069 (base_gfn >= slot->base_gfn + slot->npages)))
1074 /* Free page dirty bitmap if unneeded */
1075 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
1076 new.dirty_bitmap = NULL;
1079 if (change == KVM_MR_CREATE) {
1080 new.userspace_addr = mem->userspace_addr;
1082 if (kvm_arch_create_memslot(kvm, &new, npages))
1086 /* Allocate page dirty bitmap if needed */
1087 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
1088 if (kvm_create_dirty_bitmap(&new) < 0)
1092 slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL_ACCOUNT);
1095 memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots));
1097 if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) {
1098 slot = id_to_memslot(slots, id);
1099 slot->flags |= KVM_MEMSLOT_INVALID;
1101 old_memslots = install_new_memslots(kvm, as_id, slots);
1103 /* From this point no new shadow pages pointing to a deleted,
1104 * or moved, memslot will be created.
1106 * validation of sp->gfn happens in:
1107 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
1108 * - kvm_is_visible_gfn (mmu_check_roots)
1110 kvm_arch_flush_shadow_memslot(kvm, slot);
1113 * We can re-use the old_memslots from above, the only difference
1114 * from the currently installed memslots is the invalid flag. This
1115 * will get overwritten by update_memslots anyway.
1117 slots = old_memslots;
1120 r = kvm_arch_prepare_memory_region(kvm, &new, mem, change);
1124 /* actual memory is freed via old in kvm_free_memslot below */
1125 if (change == KVM_MR_DELETE) {
1126 new.dirty_bitmap = NULL;
1127 memset(&new.arch, 0, sizeof(new.arch));
1130 update_memslots(slots, &new, change);
1131 old_memslots = install_new_memslots(kvm, as_id, slots);
1133 kvm_arch_commit_memory_region(kvm, mem, &old, &new, change);
1135 kvm_free_memslot(kvm, &old, &new);
1136 kvfree(old_memslots);
1142 kvm_free_memslot(kvm, &new, &old);
1146 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
1148 int kvm_set_memory_region(struct kvm *kvm,
1149 const struct kvm_userspace_memory_region *mem)
1153 mutex_lock(&kvm->slots_lock);
1154 r = __kvm_set_memory_region(kvm, mem);
1155 mutex_unlock(&kvm->slots_lock);
1158 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
1160 static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
1161 struct kvm_userspace_memory_region *mem)
1163 if ((u16)mem->slot >= KVM_USER_MEM_SLOTS)
1166 return kvm_set_memory_region(kvm, mem);
1169 int kvm_get_dirty_log(struct kvm *kvm,
1170 struct kvm_dirty_log *log, int *is_dirty)
1172 struct kvm_memslots *slots;
1173 struct kvm_memory_slot *memslot;
1176 unsigned long any = 0;
1178 as_id = log->slot >> 16;
1179 id = (u16)log->slot;
1180 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1183 slots = __kvm_memslots(kvm, as_id);
1184 memslot = id_to_memslot(slots, id);
1185 if (!memslot->dirty_bitmap)
1188 n = kvm_dirty_bitmap_bytes(memslot);
1190 for (i = 0; !any && i < n/sizeof(long); ++i)
1191 any = memslot->dirty_bitmap[i];
1193 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
1200 EXPORT_SYMBOL_GPL(kvm_get_dirty_log);
1202 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1204 * kvm_get_dirty_log_protect - get a snapshot of dirty pages
1205 * and reenable dirty page tracking for the corresponding pages.
1206 * @kvm: pointer to kvm instance
1207 * @log: slot id and address to which we copy the log
1208 * @flush: true if TLB flush is needed by caller
1210 * We need to keep it in mind that VCPU threads can write to the bitmap
1211 * concurrently. So, to avoid losing track of dirty pages we keep the
1214 * 1. Take a snapshot of the bit and clear it if needed.
1215 * 2. Write protect the corresponding page.
1216 * 3. Copy the snapshot to the userspace.
1217 * 4. Upon return caller flushes TLB's if needed.
1219 * Between 2 and 4, the guest may write to the page using the remaining TLB
1220 * entry. This is not a problem because the page is reported dirty using
1221 * the snapshot taken before and step 4 ensures that writes done after
1222 * exiting to userspace will be logged for the next call.
1225 int kvm_get_dirty_log_protect(struct kvm *kvm,
1226 struct kvm_dirty_log *log, bool *flush)
1228 struct kvm_memslots *slots;
1229 struct kvm_memory_slot *memslot;
1232 unsigned long *dirty_bitmap;
1233 unsigned long *dirty_bitmap_buffer;
1235 as_id = log->slot >> 16;
1236 id = (u16)log->slot;
1237 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1240 slots = __kvm_memslots(kvm, as_id);
1241 memslot = id_to_memslot(slots, id);
1243 dirty_bitmap = memslot->dirty_bitmap;
1247 n = kvm_dirty_bitmap_bytes(memslot);
1249 if (kvm->manual_dirty_log_protect) {
1251 * Unlike kvm_get_dirty_log, we always return false in *flush,
1252 * because no flush is needed until KVM_CLEAR_DIRTY_LOG. There
1253 * is some code duplication between this function and
1254 * kvm_get_dirty_log, but hopefully all architecture
1255 * transition to kvm_get_dirty_log_protect and kvm_get_dirty_log
1256 * can be eliminated.
1258 dirty_bitmap_buffer = dirty_bitmap;
1260 dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot);
1261 memset(dirty_bitmap_buffer, 0, n);
1263 spin_lock(&kvm->mmu_lock);
1264 for (i = 0; i < n / sizeof(long); i++) {
1268 if (!dirty_bitmap[i])
1272 mask = xchg(&dirty_bitmap[i], 0);
1273 dirty_bitmap_buffer[i] = mask;
1275 offset = i * BITS_PER_LONG;
1276 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot,
1279 spin_unlock(&kvm->mmu_lock);
1282 if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
1286 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect);
1289 * kvm_clear_dirty_log_protect - clear dirty bits in the bitmap
1290 * and reenable dirty page tracking for the corresponding pages.
1291 * @kvm: pointer to kvm instance
1292 * @log: slot id and address from which to fetch the bitmap of dirty pages
1293 * @flush: true if TLB flush is needed by caller
1295 int kvm_clear_dirty_log_protect(struct kvm *kvm,
1296 struct kvm_clear_dirty_log *log, bool *flush)
1298 struct kvm_memslots *slots;
1299 struct kvm_memory_slot *memslot;
1303 unsigned long *dirty_bitmap;
1304 unsigned long *dirty_bitmap_buffer;
1306 as_id = log->slot >> 16;
1307 id = (u16)log->slot;
1308 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1311 if (log->first_page & 63)
1314 slots = __kvm_memslots(kvm, as_id);
1315 memslot = id_to_memslot(slots, id);
1317 dirty_bitmap = memslot->dirty_bitmap;
1321 n = ALIGN(log->num_pages, BITS_PER_LONG) / 8;
1323 if (log->first_page > memslot->npages ||
1324 log->num_pages > memslot->npages - log->first_page ||
1325 (log->num_pages < memslot->npages - log->first_page && (log->num_pages & 63)))
1329 dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot);
1330 if (copy_from_user(dirty_bitmap_buffer, log->dirty_bitmap, n))
1333 spin_lock(&kvm->mmu_lock);
1334 for (offset = log->first_page, i = offset / BITS_PER_LONG,
1335 n = DIV_ROUND_UP(log->num_pages, BITS_PER_LONG); n--;
1336 i++, offset += BITS_PER_LONG) {
1337 unsigned long mask = *dirty_bitmap_buffer++;
1338 atomic_long_t *p = (atomic_long_t *) &dirty_bitmap[i];
1342 mask &= atomic_long_fetch_andnot(mask, p);
1345 * mask contains the bits that really have been cleared. This
1346 * never includes any bits beyond the length of the memslot (if
1347 * the length is not aligned to 64 pages), therefore it is not
1348 * a problem if userspace sets them in log->dirty_bitmap.
1352 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot,
1356 spin_unlock(&kvm->mmu_lock);
1360 EXPORT_SYMBOL_GPL(kvm_clear_dirty_log_protect);
1363 bool kvm_largepages_enabled(void)
1365 return largepages_enabled;
1368 void kvm_disable_largepages(void)
1370 largepages_enabled = false;
1372 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
1374 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1376 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
1378 EXPORT_SYMBOL_GPL(gfn_to_memslot);
1380 struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn)
1382 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn);
1385 bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1387 struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
1389 if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS ||
1390 memslot->flags & KVM_MEMSLOT_INVALID)
1395 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1397 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1399 struct vm_area_struct *vma;
1400 unsigned long addr, size;
1404 addr = gfn_to_hva(kvm, gfn);
1405 if (kvm_is_error_hva(addr))
1408 down_read(¤t->mm->mmap_sem);
1409 vma = find_vma(current->mm, addr);
1413 size = vma_kernel_pagesize(vma);
1416 up_read(¤t->mm->mmap_sem);
1421 static bool memslot_is_readonly(struct kvm_memory_slot *slot)
1423 return slot->flags & KVM_MEM_READONLY;
1426 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1427 gfn_t *nr_pages, bool write)
1429 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1430 return KVM_HVA_ERR_BAD;
1432 if (memslot_is_readonly(slot) && write)
1433 return KVM_HVA_ERR_RO_BAD;
1436 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1438 return __gfn_to_hva_memslot(slot, gfn);
1441 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1444 return __gfn_to_hva_many(slot, gfn, nr_pages, true);
1447 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
1450 return gfn_to_hva_many(slot, gfn, NULL);
1452 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot);
1454 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1456 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1458 EXPORT_SYMBOL_GPL(gfn_to_hva);
1460 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn)
1462 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL);
1464 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva);
1467 * Return the hva of a @gfn and the R/W attribute if possible.
1469 * @slot: the kvm_memory_slot which contains @gfn
1470 * @gfn: the gfn to be translated
1471 * @writable: used to return the read/write attribute of the @slot if the hva
1472 * is valid and @writable is not NULL
1474 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot,
1475 gfn_t gfn, bool *writable)
1477 unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false);
1479 if (!kvm_is_error_hva(hva) && writable)
1480 *writable = !memslot_is_readonly(slot);
1485 unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable)
1487 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1489 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1492 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable)
1494 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1496 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1499 static inline int check_user_page_hwpoison(unsigned long addr)
1501 int rc, flags = FOLL_HWPOISON | FOLL_WRITE;
1503 rc = get_user_pages(addr, 1, flags, NULL, NULL);
1504 return rc == -EHWPOISON;
1508 * The fast path to get the writable pfn which will be stored in @pfn,
1509 * true indicates success, otherwise false is returned. It's also the
1510 * only part that runs if we can are in atomic context.
1512 static bool hva_to_pfn_fast(unsigned long addr, bool write_fault,
1513 bool *writable, kvm_pfn_t *pfn)
1515 struct page *page[1];
1519 * Fast pin a writable pfn only if it is a write fault request
1520 * or the caller allows to map a writable pfn for a read fault
1523 if (!(write_fault || writable))
1526 npages = __get_user_pages_fast(addr, 1, 1, page);
1528 *pfn = page_to_pfn(page[0]);
1539 * The slow path to get the pfn of the specified host virtual address,
1540 * 1 indicates success, -errno is returned if error is detected.
1542 static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
1543 bool *writable, kvm_pfn_t *pfn)
1545 unsigned int flags = FOLL_HWPOISON;
1552 *writable = write_fault;
1555 flags |= FOLL_WRITE;
1557 flags |= FOLL_NOWAIT;
1559 npages = get_user_pages_unlocked(addr, 1, &page, flags);
1563 /* map read fault as writable if possible */
1564 if (unlikely(!write_fault) && writable) {
1567 if (__get_user_pages_fast(addr, 1, 1, &wpage) == 1) {
1573 *pfn = page_to_pfn(page);
1577 static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
1579 if (unlikely(!(vma->vm_flags & VM_READ)))
1582 if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE))))
1588 static int hva_to_pfn_remapped(struct vm_area_struct *vma,
1589 unsigned long addr, bool *async,
1590 bool write_fault, bool *writable,
1596 r = follow_pfn(vma, addr, &pfn);
1599 * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does
1600 * not call the fault handler, so do it here.
1602 bool unlocked = false;
1603 r = fixup_user_fault(current, current->mm, addr,
1604 (write_fault ? FAULT_FLAG_WRITE : 0),
1611 r = follow_pfn(vma, addr, &pfn);
1621 * Get a reference here because callers of *hva_to_pfn* and
1622 * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the
1623 * returned pfn. This is only needed if the VMA has VM_MIXEDMAP
1624 * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will
1625 * simply do nothing for reserved pfns.
1627 * Whoever called remap_pfn_range is also going to call e.g.
1628 * unmap_mapping_range before the underlying pages are freed,
1629 * causing a call to our MMU notifier.
1638 * Pin guest page in memory and return its pfn.
1639 * @addr: host virtual address which maps memory to the guest
1640 * @atomic: whether this function can sleep
1641 * @async: whether this function need to wait IO complete if the
1642 * host page is not in the memory
1643 * @write_fault: whether we should get a writable host page
1644 * @writable: whether it allows to map a writable host page for !@write_fault
1646 * The function will map a writable host page for these two cases:
1647 * 1): @write_fault = true
1648 * 2): @write_fault = false && @writable, @writable will tell the caller
1649 * whether the mapping is writable.
1651 static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
1652 bool write_fault, bool *writable)
1654 struct vm_area_struct *vma;
1658 /* we can do it either atomically or asynchronously, not both */
1659 BUG_ON(atomic && async);
1661 if (hva_to_pfn_fast(addr, write_fault, writable, &pfn))
1665 return KVM_PFN_ERR_FAULT;
1667 npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn);
1671 down_read(¤t->mm->mmap_sem);
1672 if (npages == -EHWPOISON ||
1673 (!async && check_user_page_hwpoison(addr))) {
1674 pfn = KVM_PFN_ERR_HWPOISON;
1679 vma = find_vma_intersection(current->mm, addr, addr + 1);
1682 pfn = KVM_PFN_ERR_FAULT;
1683 else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) {
1684 r = hva_to_pfn_remapped(vma, addr, async, write_fault, writable, &pfn);
1688 pfn = KVM_PFN_ERR_FAULT;
1690 if (async && vma_is_valid(vma, write_fault))
1692 pfn = KVM_PFN_ERR_FAULT;
1695 up_read(¤t->mm->mmap_sem);
1699 kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn,
1700 bool atomic, bool *async, bool write_fault,
1703 unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
1705 if (addr == KVM_HVA_ERR_RO_BAD) {
1708 return KVM_PFN_ERR_RO_FAULT;
1711 if (kvm_is_error_hva(addr)) {
1714 return KVM_PFN_NOSLOT;
1717 /* Do not map writable pfn in the readonly memslot. */
1718 if (writable && memslot_is_readonly(slot)) {
1723 return hva_to_pfn(addr, atomic, async, write_fault,
1726 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot);
1728 kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1731 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL,
1732 write_fault, writable);
1734 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1736 kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1738 return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL);
1740 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot);
1742 kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn)
1744 return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL);
1746 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic);
1748 kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1750 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn);
1752 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1754 kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn)
1756 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1758 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic);
1760 kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1762 return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn);
1764 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1766 kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn)
1768 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1770 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn);
1772 int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1773 struct page **pages, int nr_pages)
1778 addr = gfn_to_hva_many(slot, gfn, &entry);
1779 if (kvm_is_error_hva(addr))
1782 if (entry < nr_pages)
1785 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1787 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1789 static struct page *kvm_pfn_to_page(kvm_pfn_t pfn)
1791 if (is_error_noslot_pfn(pfn))
1792 return KVM_ERR_PTR_BAD_PAGE;
1794 if (kvm_is_reserved_pfn(pfn)) {
1796 return KVM_ERR_PTR_BAD_PAGE;
1799 return pfn_to_page(pfn);
1802 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1806 pfn = gfn_to_pfn(kvm, gfn);
1808 return kvm_pfn_to_page(pfn);
1810 EXPORT_SYMBOL_GPL(gfn_to_page);
1812 static int __kvm_map_gfn(struct kvm_memslots *slots, gfn_t gfn,
1813 struct kvm_host_map *map)
1817 struct page *page = KVM_UNMAPPED_PAGE;
1818 struct kvm_memory_slot *slot = __gfn_to_memslot(slots, gfn);
1823 pfn = gfn_to_pfn_memslot(slot, gfn);
1824 if (is_error_noslot_pfn(pfn))
1827 if (pfn_valid(pfn)) {
1828 page = pfn_to_page(pfn);
1830 #ifdef CONFIG_HAS_IOMEM
1832 hva = memremap(pfn_to_hpa(pfn), PAGE_SIZE, MEMREMAP_WB);
1847 int kvm_map_gfn(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map)
1849 return __kvm_map_gfn(kvm_memslots(vcpu->kvm), gfn, map);
1851 EXPORT_SYMBOL_GPL(kvm_map_gfn);
1853 int kvm_vcpu_map(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map)
1855 return __kvm_map_gfn(kvm_vcpu_memslots(vcpu), gfn, map);
1857 EXPORT_SYMBOL_GPL(kvm_vcpu_map);
1859 static void __kvm_unmap_gfn(struct kvm_memory_slot *memslot,
1860 struct kvm_host_map *map, bool dirty)
1868 if (map->page != KVM_UNMAPPED_PAGE)
1870 #ifdef CONFIG_HAS_IOMEM
1876 mark_page_dirty_in_slot(memslot, map->gfn);
1877 kvm_release_pfn_dirty(map->pfn);
1879 kvm_release_pfn_clean(map->pfn);
1886 int kvm_unmap_gfn(struct kvm_vcpu *vcpu, struct kvm_host_map *map, bool dirty)
1888 __kvm_unmap_gfn(gfn_to_memslot(vcpu->kvm, map->gfn), map, dirty);
1891 EXPORT_SYMBOL_GPL(kvm_unmap_gfn);
1893 void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map, bool dirty)
1895 __kvm_unmap_gfn(kvm_vcpu_gfn_to_memslot(vcpu, map->gfn), map, dirty);
1897 EXPORT_SYMBOL_GPL(kvm_vcpu_unmap);
1899 struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn)
1903 pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn);
1905 return kvm_pfn_to_page(pfn);
1907 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page);
1909 void kvm_release_page_clean(struct page *page)
1911 WARN_ON(is_error_page(page));
1913 kvm_release_pfn_clean(page_to_pfn(page));
1915 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1917 void kvm_release_pfn_clean(kvm_pfn_t pfn)
1919 if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn))
1920 put_page(pfn_to_page(pfn));
1922 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1924 void kvm_release_page_dirty(struct page *page)
1926 WARN_ON(is_error_page(page));
1928 kvm_release_pfn_dirty(page_to_pfn(page));
1930 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1932 void kvm_release_pfn_dirty(kvm_pfn_t pfn)
1934 kvm_set_pfn_dirty(pfn);
1935 kvm_release_pfn_clean(pfn);
1937 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1939 void kvm_set_pfn_dirty(kvm_pfn_t pfn)
1941 if (!kvm_is_reserved_pfn(pfn) && !kvm_is_zone_device_pfn(pfn)) {
1942 struct page *page = pfn_to_page(pfn);
1947 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1949 void kvm_set_pfn_accessed(kvm_pfn_t pfn)
1951 if (!kvm_is_reserved_pfn(pfn) && !kvm_is_zone_device_pfn(pfn))
1952 mark_page_accessed(pfn_to_page(pfn));
1954 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1956 void kvm_get_pfn(kvm_pfn_t pfn)
1958 if (!kvm_is_reserved_pfn(pfn))
1959 get_page(pfn_to_page(pfn));
1961 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1963 static int next_segment(unsigned long len, int offset)
1965 if (len > PAGE_SIZE - offset)
1966 return PAGE_SIZE - offset;
1971 static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn,
1972 void *data, int offset, int len)
1977 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1978 if (kvm_is_error_hva(addr))
1980 r = __copy_from_user(data, (void __user *)addr + offset, len);
1986 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1989 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1991 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1993 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1995 int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data,
1996 int offset, int len)
1998 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
2000 return __kvm_read_guest_page(slot, gfn, data, offset, len);
2002 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page);
2004 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
2006 gfn_t gfn = gpa >> PAGE_SHIFT;
2008 int offset = offset_in_page(gpa);
2011 while ((seg = next_segment(len, offset)) != 0) {
2012 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
2022 EXPORT_SYMBOL_GPL(kvm_read_guest);
2024 int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len)
2026 gfn_t gfn = gpa >> PAGE_SHIFT;
2028 int offset = offset_in_page(gpa);
2031 while ((seg = next_segment(len, offset)) != 0) {
2032 ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg);
2042 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest);
2044 static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
2045 void *data, int offset, unsigned long len)
2050 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
2051 if (kvm_is_error_hva(addr))
2053 pagefault_disable();
2054 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
2061 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
2064 gfn_t gfn = gpa >> PAGE_SHIFT;
2065 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
2066 int offset = offset_in_page(gpa);
2068 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
2070 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic);
2072 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa,
2073 void *data, unsigned long len)
2075 gfn_t gfn = gpa >> PAGE_SHIFT;
2076 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
2077 int offset = offset_in_page(gpa);
2079 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
2081 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic);
2083 static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn,
2084 const void *data, int offset, int len)
2089 addr = gfn_to_hva_memslot(memslot, gfn);
2090 if (kvm_is_error_hva(addr))
2092 r = __copy_to_user((void __user *)addr + offset, data, len);
2095 mark_page_dirty_in_slot(memslot, gfn);
2099 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn,
2100 const void *data, int offset, int len)
2102 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
2104 return __kvm_write_guest_page(slot, gfn, data, offset, len);
2106 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
2108 int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
2109 const void *data, int offset, int len)
2111 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
2113 return __kvm_write_guest_page(slot, gfn, data, offset, len);
2115 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page);
2117 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
2120 gfn_t gfn = gpa >> PAGE_SHIFT;
2122 int offset = offset_in_page(gpa);
2125 while ((seg = next_segment(len, offset)) != 0) {
2126 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
2136 EXPORT_SYMBOL_GPL(kvm_write_guest);
2138 int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
2141 gfn_t gfn = gpa >> PAGE_SHIFT;
2143 int offset = offset_in_page(gpa);
2146 while ((seg = next_segment(len, offset)) != 0) {
2147 ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg);
2157 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest);
2159 static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots *slots,
2160 struct gfn_to_hva_cache *ghc,
2161 gpa_t gpa, unsigned long len)
2163 int offset = offset_in_page(gpa);
2164 gfn_t start_gfn = gpa >> PAGE_SHIFT;
2165 gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT;
2166 gfn_t nr_pages_needed = end_gfn - start_gfn + 1;
2167 gfn_t nr_pages_avail;
2168 int r = start_gfn <= end_gfn ? 0 : -EINVAL;
2171 ghc->generation = slots->generation;
2173 ghc->hva = KVM_HVA_ERR_BAD;
2176 * If the requested region crosses two memslots, we still
2177 * verify that the entire region is valid here.
2179 while (!r && start_gfn <= end_gfn) {
2180 ghc->memslot = __gfn_to_memslot(slots, start_gfn);
2181 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn,
2183 if (kvm_is_error_hva(ghc->hva))
2185 start_gfn += nr_pages_avail;
2188 /* Use the slow path for cross page reads and writes. */
2189 if (!r && nr_pages_needed == 1)
2192 ghc->memslot = NULL;
2197 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
2198 gpa_t gpa, unsigned long len)
2200 struct kvm_memslots *slots = kvm_memslots(kvm);
2201 return __kvm_gfn_to_hva_cache_init(slots, ghc, gpa, len);
2203 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
2205 int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
2206 void *data, unsigned int offset,
2209 struct kvm_memslots *slots = kvm_memslots(kvm);
2211 gpa_t gpa = ghc->gpa + offset;
2213 BUG_ON(len + offset > ghc->len);
2215 if (slots->generation != ghc->generation)
2216 __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len);
2218 if (unlikely(!ghc->memslot))
2219 return kvm_write_guest(kvm, gpa, data, len);
2221 if (kvm_is_error_hva(ghc->hva))
2224 r = __copy_to_user((void __user *)ghc->hva + offset, data, len);
2227 mark_page_dirty_in_slot(ghc->memslot, gpa >> PAGE_SHIFT);
2231 EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached);
2233 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
2234 void *data, unsigned long len)
2236 return kvm_write_guest_offset_cached(kvm, ghc, data, 0, len);
2238 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
2240 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
2241 void *data, unsigned long len)
2243 struct kvm_memslots *slots = kvm_memslots(kvm);
2246 BUG_ON(len > ghc->len);
2248 if (slots->generation != ghc->generation)
2249 __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len);
2251 if (unlikely(!ghc->memslot))
2252 return kvm_read_guest(kvm, ghc->gpa, data, len);
2254 if (kvm_is_error_hva(ghc->hva))
2257 r = __copy_from_user(data, (void __user *)ghc->hva, len);
2263 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
2265 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
2267 const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0)));
2269 return kvm_write_guest_page(kvm, gfn, zero_page, offset, len);
2271 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
2273 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
2275 gfn_t gfn = gpa >> PAGE_SHIFT;
2277 int offset = offset_in_page(gpa);
2280 while ((seg = next_segment(len, offset)) != 0) {
2281 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
2290 EXPORT_SYMBOL_GPL(kvm_clear_guest);
2292 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot,
2295 if (memslot && memslot->dirty_bitmap) {
2296 unsigned long rel_gfn = gfn - memslot->base_gfn;
2298 set_bit_le(rel_gfn, memslot->dirty_bitmap);
2302 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
2304 struct kvm_memory_slot *memslot;
2306 memslot = gfn_to_memslot(kvm, gfn);
2307 mark_page_dirty_in_slot(memslot, gfn);
2309 EXPORT_SYMBOL_GPL(mark_page_dirty);
2311 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn)
2313 struct kvm_memory_slot *memslot;
2315 memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
2316 mark_page_dirty_in_slot(memslot, gfn);
2318 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty);
2320 void kvm_sigset_activate(struct kvm_vcpu *vcpu)
2322 if (!vcpu->sigset_active)
2326 * This does a lockless modification of ->real_blocked, which is fine
2327 * because, only current can change ->real_blocked and all readers of
2328 * ->real_blocked don't care as long ->real_blocked is always a subset
2331 sigprocmask(SIG_SETMASK, &vcpu->sigset, ¤t->real_blocked);
2334 void kvm_sigset_deactivate(struct kvm_vcpu *vcpu)
2336 if (!vcpu->sigset_active)
2339 sigprocmask(SIG_SETMASK, ¤t->real_blocked, NULL);
2340 sigemptyset(¤t->real_blocked);
2343 static void grow_halt_poll_ns(struct kvm_vcpu *vcpu)
2345 unsigned int old, val, grow, grow_start;
2347 old = val = vcpu->halt_poll_ns;
2348 grow_start = READ_ONCE(halt_poll_ns_grow_start);
2349 grow = READ_ONCE(halt_poll_ns_grow);
2354 if (val < grow_start)
2357 if (val > halt_poll_ns)
2360 vcpu->halt_poll_ns = val;
2362 trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old);
2365 static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu)
2367 unsigned int old, val, shrink;
2369 old = val = vcpu->halt_poll_ns;
2370 shrink = READ_ONCE(halt_poll_ns_shrink);
2376 vcpu->halt_poll_ns = val;
2377 trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old);
2380 static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu)
2383 int idx = srcu_read_lock(&vcpu->kvm->srcu);
2385 if (kvm_arch_vcpu_runnable(vcpu)) {
2386 kvm_make_request(KVM_REQ_UNHALT, vcpu);
2389 if (kvm_cpu_has_pending_timer(vcpu))
2391 if (signal_pending(current))
2396 srcu_read_unlock(&vcpu->kvm->srcu, idx);
2401 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
2403 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
2406 DECLARE_SWAITQUEUE(wait);
2407 bool waited = false;
2410 kvm_arch_vcpu_blocking(vcpu);
2412 start = cur = ktime_get();
2413 if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
2414 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
2416 ++vcpu->stat.halt_attempted_poll;
2419 * This sets KVM_REQ_UNHALT if an interrupt
2422 if (kvm_vcpu_check_block(vcpu) < 0) {
2423 ++vcpu->stat.halt_successful_poll;
2424 if (!vcpu_valid_wakeup(vcpu))
2425 ++vcpu->stat.halt_poll_invalid;
2429 } while (single_task_running() && ktime_before(cur, stop));
2433 prepare_to_swait_exclusive(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
2435 if (kvm_vcpu_check_block(vcpu) < 0)
2442 finish_swait(&vcpu->wq, &wait);
2445 kvm_arch_vcpu_unblocking(vcpu);
2446 block_ns = ktime_to_ns(cur) - ktime_to_ns(start);
2448 if (!kvm_arch_no_poll(vcpu)) {
2449 if (!vcpu_valid_wakeup(vcpu)) {
2450 shrink_halt_poll_ns(vcpu);
2451 } else if (halt_poll_ns) {
2452 if (block_ns <= vcpu->halt_poll_ns)
2454 /* we had a long block, shrink polling */
2455 else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns)
2456 shrink_halt_poll_ns(vcpu);
2457 /* we had a short halt and our poll time is too small */
2458 else if (vcpu->halt_poll_ns < halt_poll_ns &&
2459 block_ns < halt_poll_ns)
2460 grow_halt_poll_ns(vcpu);
2462 vcpu->halt_poll_ns = 0;
2466 trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu));
2467 kvm_arch_vcpu_block_finish(vcpu);
2469 EXPORT_SYMBOL_GPL(kvm_vcpu_block);
2471 bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
2473 struct swait_queue_head *wqp;
2475 wqp = kvm_arch_vcpu_wq(vcpu);
2476 if (swq_has_sleeper(wqp)) {
2478 WRITE_ONCE(vcpu->ready, true);
2479 ++vcpu->stat.halt_wakeup;
2485 EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up);
2489 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2491 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
2494 int cpu = vcpu->cpu;
2496 if (kvm_vcpu_wake_up(vcpu))
2500 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
2501 if (kvm_arch_vcpu_should_kick(vcpu))
2502 smp_send_reschedule(cpu);
2505 EXPORT_SYMBOL_GPL(kvm_vcpu_kick);
2506 #endif /* !CONFIG_S390 */
2508 int kvm_vcpu_yield_to(struct kvm_vcpu *target)
2511 struct task_struct *task = NULL;
2515 pid = rcu_dereference(target->pid);
2517 task = get_pid_task(pid, PIDTYPE_PID);
2521 ret = yield_to(task, 1);
2522 put_task_struct(task);
2526 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
2529 * Helper that checks whether a VCPU is eligible for directed yield.
2530 * Most eligible candidate to yield is decided by following heuristics:
2532 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2533 * (preempted lock holder), indicated by @in_spin_loop.
2534 * Set at the beiginning and cleared at the end of interception/PLE handler.
2536 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2537 * chance last time (mostly it has become eligible now since we have probably
2538 * yielded to lockholder in last iteration. This is done by toggling
2539 * @dy_eligible each time a VCPU checked for eligibility.)
2541 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2542 * to preempted lock-holder could result in wrong VCPU selection and CPU
2543 * burning. Giving priority for a potential lock-holder increases lock
2546 * Since algorithm is based on heuristics, accessing another VCPU data without
2547 * locking does not harm. It may result in trying to yield to same VCPU, fail
2548 * and continue with next VCPU and so on.
2550 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
2552 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2555 eligible = !vcpu->spin_loop.in_spin_loop ||
2556 vcpu->spin_loop.dy_eligible;
2558 if (vcpu->spin_loop.in_spin_loop)
2559 kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible);
2568 * Unlike kvm_arch_vcpu_runnable, this function is called outside
2569 * a vcpu_load/vcpu_put pair. However, for most architectures
2570 * kvm_arch_vcpu_runnable does not require vcpu_load.
2572 bool __weak kvm_arch_dy_runnable(struct kvm_vcpu *vcpu)
2574 return kvm_arch_vcpu_runnable(vcpu);
2577 static bool vcpu_dy_runnable(struct kvm_vcpu *vcpu)
2579 if (kvm_arch_dy_runnable(vcpu))
2582 #ifdef CONFIG_KVM_ASYNC_PF
2583 if (!list_empty_careful(&vcpu->async_pf.done))
2590 void kvm_vcpu_on_spin(struct kvm_vcpu *me, bool yield_to_kernel_mode)
2592 struct kvm *kvm = me->kvm;
2593 struct kvm_vcpu *vcpu;
2594 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
2600 kvm_vcpu_set_in_spin_loop(me, true);
2602 * We boost the priority of a VCPU that is runnable but not
2603 * currently running, because it got preempted by something
2604 * else and called schedule in __vcpu_run. Hopefully that
2605 * VCPU is holding the lock that we need and will release it.
2606 * We approximate round-robin by starting at the last boosted VCPU.
2608 for (pass = 0; pass < 2 && !yielded && try; pass++) {
2609 kvm_for_each_vcpu(i, vcpu, kvm) {
2610 if (!pass && i <= last_boosted_vcpu) {
2611 i = last_boosted_vcpu;
2613 } else if (pass && i > last_boosted_vcpu)
2615 if (!READ_ONCE(vcpu->ready))
2619 if (swait_active(&vcpu->wq) && !vcpu_dy_runnable(vcpu))
2621 if (READ_ONCE(vcpu->preempted) && yield_to_kernel_mode &&
2622 !kvm_arch_vcpu_in_kernel(vcpu))
2624 if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
2627 yielded = kvm_vcpu_yield_to(vcpu);
2629 kvm->last_boosted_vcpu = i;
2631 } else if (yielded < 0) {
2638 kvm_vcpu_set_in_spin_loop(me, false);
2640 /* Ensure vcpu is not eligible during next spinloop */
2641 kvm_vcpu_set_dy_eligible(me, false);
2643 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
2645 static vm_fault_t kvm_vcpu_fault(struct vm_fault *vmf)
2647 struct kvm_vcpu *vcpu = vmf->vma->vm_file->private_data;
2650 if (vmf->pgoff == 0)
2651 page = virt_to_page(vcpu->run);
2653 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
2654 page = virt_to_page(vcpu->arch.pio_data);
2656 #ifdef CONFIG_KVM_MMIO
2657 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
2658 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
2661 return kvm_arch_vcpu_fault(vcpu, vmf);
2667 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
2668 .fault = kvm_vcpu_fault,
2671 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2673 vma->vm_ops = &kvm_vcpu_vm_ops;
2677 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2679 struct kvm_vcpu *vcpu = filp->private_data;
2681 debugfs_remove_recursive(vcpu->debugfs_dentry);
2682 kvm_put_kvm(vcpu->kvm);
2686 static struct file_operations kvm_vcpu_fops = {
2687 .release = kvm_vcpu_release,
2688 .unlocked_ioctl = kvm_vcpu_ioctl,
2689 .mmap = kvm_vcpu_mmap,
2690 .llseek = noop_llseek,
2691 KVM_COMPAT(kvm_vcpu_compat_ioctl),
2695 * Allocates an inode for the vcpu.
2697 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2699 char name[8 + 1 + ITOA_MAX_LEN + 1];
2701 snprintf(name, sizeof(name), "kvm-vcpu:%d", vcpu->vcpu_id);
2702 return anon_inode_getfd(name, &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC);
2705 static void kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
2707 #ifdef __KVM_HAVE_ARCH_VCPU_DEBUGFS
2708 char dir_name[ITOA_MAX_LEN * 2];
2710 if (!debugfs_initialized())
2713 snprintf(dir_name, sizeof(dir_name), "vcpu%d", vcpu->vcpu_id);
2714 vcpu->debugfs_dentry = debugfs_create_dir(dir_name,
2715 vcpu->kvm->debugfs_dentry);
2717 kvm_arch_create_vcpu_debugfs(vcpu);
2722 * Creates some virtual cpus. Good luck creating more than one.
2724 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
2727 struct kvm_vcpu *vcpu;
2729 if (id >= KVM_MAX_VCPU_ID)
2732 mutex_lock(&kvm->lock);
2733 if (kvm->created_vcpus == KVM_MAX_VCPUS) {
2734 mutex_unlock(&kvm->lock);
2738 kvm->created_vcpus++;
2739 mutex_unlock(&kvm->lock);
2741 vcpu = kvm_arch_vcpu_create(kvm, id);
2744 goto vcpu_decrement;
2747 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2749 r = kvm_arch_vcpu_setup(vcpu);
2753 kvm_create_vcpu_debugfs(vcpu);
2755 mutex_lock(&kvm->lock);
2756 if (kvm_get_vcpu_by_id(kvm, id)) {
2758 goto unlock_vcpu_destroy;
2761 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
2763 /* Now it's all set up, let userspace reach it */
2765 r = create_vcpu_fd(vcpu);
2768 goto unlock_vcpu_destroy;
2771 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
2774 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
2775 * before kvm->online_vcpu's incremented value.
2778 atomic_inc(&kvm->online_vcpus);
2780 mutex_unlock(&kvm->lock);
2781 kvm_arch_vcpu_postcreate(vcpu);
2784 unlock_vcpu_destroy:
2785 mutex_unlock(&kvm->lock);
2786 debugfs_remove_recursive(vcpu->debugfs_dentry);
2788 kvm_arch_vcpu_destroy(vcpu);
2790 mutex_lock(&kvm->lock);
2791 kvm->created_vcpus--;
2792 mutex_unlock(&kvm->lock);
2796 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2799 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2800 vcpu->sigset_active = 1;
2801 vcpu->sigset = *sigset;
2803 vcpu->sigset_active = 0;
2807 static long kvm_vcpu_ioctl(struct file *filp,
2808 unsigned int ioctl, unsigned long arg)
2810 struct kvm_vcpu *vcpu = filp->private_data;
2811 void __user *argp = (void __user *)arg;
2813 struct kvm_fpu *fpu = NULL;
2814 struct kvm_sregs *kvm_sregs = NULL;
2816 if (vcpu->kvm->mm != current->mm)
2819 if (unlikely(_IOC_TYPE(ioctl) != KVMIO))
2823 * Some architectures have vcpu ioctls that are asynchronous to vcpu
2824 * execution; mutex_lock() would break them.
2826 r = kvm_arch_vcpu_async_ioctl(filp, ioctl, arg);
2827 if (r != -ENOIOCTLCMD)
2830 if (mutex_lock_killable(&vcpu->mutex))
2838 oldpid = rcu_access_pointer(vcpu->pid);
2839 if (unlikely(oldpid != task_pid(current))) {
2840 /* The thread running this VCPU changed. */
2843 r = kvm_arch_vcpu_run_pid_change(vcpu);
2847 newpid = get_task_pid(current, PIDTYPE_PID);
2848 rcu_assign_pointer(vcpu->pid, newpid);
2853 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
2854 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
2857 case KVM_GET_REGS: {
2858 struct kvm_regs *kvm_regs;
2861 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL_ACCOUNT);
2864 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
2868 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
2875 case KVM_SET_REGS: {
2876 struct kvm_regs *kvm_regs;
2879 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
2880 if (IS_ERR(kvm_regs)) {
2881 r = PTR_ERR(kvm_regs);
2884 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
2888 case KVM_GET_SREGS: {
2889 kvm_sregs = kzalloc(sizeof(struct kvm_sregs),
2890 GFP_KERNEL_ACCOUNT);
2894 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
2898 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
2903 case KVM_SET_SREGS: {
2904 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
2905 if (IS_ERR(kvm_sregs)) {
2906 r = PTR_ERR(kvm_sregs);
2910 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
2913 case KVM_GET_MP_STATE: {
2914 struct kvm_mp_state mp_state;
2916 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
2920 if (copy_to_user(argp, &mp_state, sizeof(mp_state)))
2925 case KVM_SET_MP_STATE: {
2926 struct kvm_mp_state mp_state;
2929 if (copy_from_user(&mp_state, argp, sizeof(mp_state)))
2931 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
2934 case KVM_TRANSLATE: {
2935 struct kvm_translation tr;
2938 if (copy_from_user(&tr, argp, sizeof(tr)))
2940 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
2944 if (copy_to_user(argp, &tr, sizeof(tr)))
2949 case KVM_SET_GUEST_DEBUG: {
2950 struct kvm_guest_debug dbg;
2953 if (copy_from_user(&dbg, argp, sizeof(dbg)))
2955 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
2958 case KVM_SET_SIGNAL_MASK: {
2959 struct kvm_signal_mask __user *sigmask_arg = argp;
2960 struct kvm_signal_mask kvm_sigmask;
2961 sigset_t sigset, *p;
2966 if (copy_from_user(&kvm_sigmask, argp,
2967 sizeof(kvm_sigmask)))
2970 if (kvm_sigmask.len != sizeof(sigset))
2973 if (copy_from_user(&sigset, sigmask_arg->sigset,
2978 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
2982 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL_ACCOUNT);
2986 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
2990 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
2996 fpu = memdup_user(argp, sizeof(*fpu));
3002 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
3006 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
3009 mutex_unlock(&vcpu->mutex);
3015 #ifdef CONFIG_KVM_COMPAT
3016 static long kvm_vcpu_compat_ioctl(struct file *filp,
3017 unsigned int ioctl, unsigned long arg)
3019 struct kvm_vcpu *vcpu = filp->private_data;
3020 void __user *argp = compat_ptr(arg);
3023 if (vcpu->kvm->mm != current->mm)
3027 case KVM_SET_SIGNAL_MASK: {
3028 struct kvm_signal_mask __user *sigmask_arg = argp;
3029 struct kvm_signal_mask kvm_sigmask;
3034 if (copy_from_user(&kvm_sigmask, argp,
3035 sizeof(kvm_sigmask)))
3038 if (kvm_sigmask.len != sizeof(compat_sigset_t))
3041 if (get_compat_sigset(&sigset, (void *)sigmask_arg->sigset))
3043 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
3045 r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
3049 r = kvm_vcpu_ioctl(filp, ioctl, arg);
3057 static int kvm_device_mmap(struct file *filp, struct vm_area_struct *vma)
3059 struct kvm_device *dev = filp->private_data;
3062 return dev->ops->mmap(dev, vma);
3067 static int kvm_device_ioctl_attr(struct kvm_device *dev,
3068 int (*accessor)(struct kvm_device *dev,
3069 struct kvm_device_attr *attr),
3072 struct kvm_device_attr attr;
3077 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
3080 return accessor(dev, &attr);
3083 static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
3086 struct kvm_device *dev = filp->private_data;
3088 if (dev->kvm->mm != current->mm)
3092 case KVM_SET_DEVICE_ATTR:
3093 return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg);
3094 case KVM_GET_DEVICE_ATTR:
3095 return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg);
3096 case KVM_HAS_DEVICE_ATTR:
3097 return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg);
3099 if (dev->ops->ioctl)
3100 return dev->ops->ioctl(dev, ioctl, arg);
3106 static int kvm_device_release(struct inode *inode, struct file *filp)
3108 struct kvm_device *dev = filp->private_data;
3109 struct kvm *kvm = dev->kvm;
3111 if (dev->ops->release) {
3112 mutex_lock(&kvm->lock);
3113 list_del(&dev->vm_node);
3114 dev->ops->release(dev);
3115 mutex_unlock(&kvm->lock);
3122 static const struct file_operations kvm_device_fops = {
3123 .unlocked_ioctl = kvm_device_ioctl,
3124 .release = kvm_device_release,
3125 KVM_COMPAT(kvm_device_ioctl),
3126 .mmap = kvm_device_mmap,
3129 struct kvm_device *kvm_device_from_filp(struct file *filp)
3131 if (filp->f_op != &kvm_device_fops)
3134 return filp->private_data;
3137 static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = {
3138 #ifdef CONFIG_KVM_MPIC
3139 [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops,
3140 [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops,
3144 int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type)
3146 if (type >= ARRAY_SIZE(kvm_device_ops_table))
3149 if (kvm_device_ops_table[type] != NULL)
3152 kvm_device_ops_table[type] = ops;
3156 void kvm_unregister_device_ops(u32 type)
3158 if (kvm_device_ops_table[type] != NULL)
3159 kvm_device_ops_table[type] = NULL;
3162 static int kvm_ioctl_create_device(struct kvm *kvm,
3163 struct kvm_create_device *cd)
3165 struct kvm_device_ops *ops = NULL;
3166 struct kvm_device *dev;
3167 bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
3171 if (cd->type >= ARRAY_SIZE(kvm_device_ops_table))
3174 type = array_index_nospec(cd->type, ARRAY_SIZE(kvm_device_ops_table));
3175 ops = kvm_device_ops_table[type];
3182 dev = kzalloc(sizeof(*dev), GFP_KERNEL_ACCOUNT);
3189 mutex_lock(&kvm->lock);
3190 ret = ops->create(dev, type);
3192 mutex_unlock(&kvm->lock);
3196 list_add(&dev->vm_node, &kvm->devices);
3197 mutex_unlock(&kvm->lock);
3203 ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC);
3206 mutex_lock(&kvm->lock);
3207 list_del(&dev->vm_node);
3208 mutex_unlock(&kvm->lock);
3217 static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
3220 case KVM_CAP_USER_MEMORY:
3221 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
3222 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
3223 case KVM_CAP_INTERNAL_ERROR_DATA:
3224 #ifdef CONFIG_HAVE_KVM_MSI
3225 case KVM_CAP_SIGNAL_MSI:
3227 #ifdef CONFIG_HAVE_KVM_IRQFD
3229 case KVM_CAP_IRQFD_RESAMPLE:
3231 case KVM_CAP_IOEVENTFD_ANY_LENGTH:
3232 case KVM_CAP_CHECK_EXTENSION_VM:
3233 case KVM_CAP_ENABLE_CAP_VM:
3234 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
3235 case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2:
3238 #ifdef CONFIG_KVM_MMIO
3239 case KVM_CAP_COALESCED_MMIO:
3240 return KVM_COALESCED_MMIO_PAGE_OFFSET;
3241 case KVM_CAP_COALESCED_PIO:
3244 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3245 case KVM_CAP_IRQ_ROUTING:
3246 return KVM_MAX_IRQ_ROUTES;
3248 #if KVM_ADDRESS_SPACE_NUM > 1
3249 case KVM_CAP_MULTI_ADDRESS_SPACE:
3250 return KVM_ADDRESS_SPACE_NUM;
3252 case KVM_CAP_NR_MEMSLOTS:
3253 return KVM_USER_MEM_SLOTS;
3257 return kvm_vm_ioctl_check_extension(kvm, arg);
3260 int __attribute__((weak)) kvm_vm_ioctl_enable_cap(struct kvm *kvm,
3261 struct kvm_enable_cap *cap)
3266 static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm,
3267 struct kvm_enable_cap *cap)
3270 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
3271 case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2:
3272 if (cap->flags || (cap->args[0] & ~1))
3274 kvm->manual_dirty_log_protect = cap->args[0];
3278 return kvm_vm_ioctl_enable_cap(kvm, cap);
3282 static long kvm_vm_ioctl(struct file *filp,
3283 unsigned int ioctl, unsigned long arg)
3285 struct kvm *kvm = filp->private_data;
3286 void __user *argp = (void __user *)arg;
3289 if (kvm->mm != current->mm)
3292 case KVM_CREATE_VCPU:
3293 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
3295 case KVM_ENABLE_CAP: {
3296 struct kvm_enable_cap cap;
3299 if (copy_from_user(&cap, argp, sizeof(cap)))
3301 r = kvm_vm_ioctl_enable_cap_generic(kvm, &cap);
3304 case KVM_SET_USER_MEMORY_REGION: {
3305 struct kvm_userspace_memory_region kvm_userspace_mem;
3308 if (copy_from_user(&kvm_userspace_mem, argp,
3309 sizeof(kvm_userspace_mem)))
3312 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem);
3315 case KVM_GET_DIRTY_LOG: {
3316 struct kvm_dirty_log log;
3319 if (copy_from_user(&log, argp, sizeof(log)))
3321 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
3324 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
3325 case KVM_CLEAR_DIRTY_LOG: {
3326 struct kvm_clear_dirty_log log;
3329 if (copy_from_user(&log, argp, sizeof(log)))
3331 r = kvm_vm_ioctl_clear_dirty_log(kvm, &log);
3335 #ifdef CONFIG_KVM_MMIO
3336 case KVM_REGISTER_COALESCED_MMIO: {
3337 struct kvm_coalesced_mmio_zone zone;
3340 if (copy_from_user(&zone, argp, sizeof(zone)))
3342 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
3345 case KVM_UNREGISTER_COALESCED_MMIO: {
3346 struct kvm_coalesced_mmio_zone zone;
3349 if (copy_from_user(&zone, argp, sizeof(zone)))
3351 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
3356 struct kvm_irqfd data;
3359 if (copy_from_user(&data, argp, sizeof(data)))
3361 r = kvm_irqfd(kvm, &data);
3364 case KVM_IOEVENTFD: {
3365 struct kvm_ioeventfd data;
3368 if (copy_from_user(&data, argp, sizeof(data)))
3370 r = kvm_ioeventfd(kvm, &data);
3373 #ifdef CONFIG_HAVE_KVM_MSI
3374 case KVM_SIGNAL_MSI: {
3378 if (copy_from_user(&msi, argp, sizeof(msi)))
3380 r = kvm_send_userspace_msi(kvm, &msi);
3384 #ifdef __KVM_HAVE_IRQ_LINE
3385 case KVM_IRQ_LINE_STATUS:
3386 case KVM_IRQ_LINE: {
3387 struct kvm_irq_level irq_event;
3390 if (copy_from_user(&irq_event, argp, sizeof(irq_event)))
3393 r = kvm_vm_ioctl_irq_line(kvm, &irq_event,
3394 ioctl == KVM_IRQ_LINE_STATUS);
3399 if (ioctl == KVM_IRQ_LINE_STATUS) {
3400 if (copy_to_user(argp, &irq_event, sizeof(irq_event)))
3408 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3409 case KVM_SET_GSI_ROUTING: {
3410 struct kvm_irq_routing routing;
3411 struct kvm_irq_routing __user *urouting;
3412 struct kvm_irq_routing_entry *entries = NULL;
3415 if (copy_from_user(&routing, argp, sizeof(routing)))
3418 if (!kvm_arch_can_set_irq_routing(kvm))
3420 if (routing.nr > KVM_MAX_IRQ_ROUTES)
3426 entries = vmalloc(array_size(sizeof(*entries),
3432 if (copy_from_user(entries, urouting->entries,
3433 routing.nr * sizeof(*entries)))
3434 goto out_free_irq_routing;
3436 r = kvm_set_irq_routing(kvm, entries, routing.nr,
3438 out_free_irq_routing:
3442 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
3443 case KVM_CREATE_DEVICE: {
3444 struct kvm_create_device cd;
3447 if (copy_from_user(&cd, argp, sizeof(cd)))
3450 r = kvm_ioctl_create_device(kvm, &cd);
3455 if (copy_to_user(argp, &cd, sizeof(cd)))
3461 case KVM_CHECK_EXTENSION:
3462 r = kvm_vm_ioctl_check_extension_generic(kvm, arg);
3465 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
3471 #ifdef CONFIG_KVM_COMPAT
3472 struct compat_kvm_dirty_log {
3476 compat_uptr_t dirty_bitmap; /* one bit per page */
3481 static long kvm_vm_compat_ioctl(struct file *filp,
3482 unsigned int ioctl, unsigned long arg)
3484 struct kvm *kvm = filp->private_data;
3487 if (kvm->mm != current->mm)
3490 case KVM_GET_DIRTY_LOG: {
3491 struct compat_kvm_dirty_log compat_log;
3492 struct kvm_dirty_log log;
3494 if (copy_from_user(&compat_log, (void __user *)arg,
3495 sizeof(compat_log)))
3497 log.slot = compat_log.slot;
3498 log.padding1 = compat_log.padding1;
3499 log.padding2 = compat_log.padding2;
3500 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
3502 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
3506 r = kvm_vm_ioctl(filp, ioctl, arg);
3512 static struct file_operations kvm_vm_fops = {
3513 .release = kvm_vm_release,
3514 .unlocked_ioctl = kvm_vm_ioctl,
3515 .llseek = noop_llseek,
3516 KVM_COMPAT(kvm_vm_compat_ioctl),
3519 static int kvm_dev_ioctl_create_vm(unsigned long type)
3525 kvm = kvm_create_vm(type);
3527 return PTR_ERR(kvm);
3528 #ifdef CONFIG_KVM_MMIO
3529 r = kvm_coalesced_mmio_init(kvm);
3533 r = get_unused_fd_flags(O_CLOEXEC);
3537 file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
3545 * Don't call kvm_put_kvm anymore at this point; file->f_op is
3546 * already set, with ->release() being kvm_vm_release(). In error
3547 * cases it will be called by the final fput(file) and will take
3548 * care of doing kvm_put_kvm(kvm).
3550 if (kvm_create_vm_debugfs(kvm, r) < 0) {
3555 kvm_uevent_notify_change(KVM_EVENT_CREATE_VM, kvm);
3557 fd_install(r, file);
3565 static long kvm_dev_ioctl(struct file *filp,
3566 unsigned int ioctl, unsigned long arg)
3571 case KVM_GET_API_VERSION:
3574 r = KVM_API_VERSION;
3577 r = kvm_dev_ioctl_create_vm(arg);
3579 case KVM_CHECK_EXTENSION:
3580 r = kvm_vm_ioctl_check_extension_generic(NULL, arg);
3582 case KVM_GET_VCPU_MMAP_SIZE:
3585 r = PAGE_SIZE; /* struct kvm_run */
3587 r += PAGE_SIZE; /* pio data page */
3589 #ifdef CONFIG_KVM_MMIO
3590 r += PAGE_SIZE; /* coalesced mmio ring page */
3593 case KVM_TRACE_ENABLE:
3594 case KVM_TRACE_PAUSE:
3595 case KVM_TRACE_DISABLE:
3599 return kvm_arch_dev_ioctl(filp, ioctl, arg);
3605 static struct file_operations kvm_chardev_ops = {
3606 .unlocked_ioctl = kvm_dev_ioctl,
3607 .llseek = noop_llseek,
3608 KVM_COMPAT(kvm_dev_ioctl),
3611 static struct miscdevice kvm_dev = {
3617 static void hardware_enable_nolock(void *junk)
3619 int cpu = raw_smp_processor_id();
3622 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
3625 cpumask_set_cpu(cpu, cpus_hardware_enabled);
3627 r = kvm_arch_hardware_enable();
3630 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3631 atomic_inc(&hardware_enable_failed);
3632 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu);
3636 static int kvm_starting_cpu(unsigned int cpu)
3638 raw_spin_lock(&kvm_count_lock);
3639 if (kvm_usage_count)
3640 hardware_enable_nolock(NULL);
3641 raw_spin_unlock(&kvm_count_lock);
3645 static void hardware_disable_nolock(void *junk)
3647 int cpu = raw_smp_processor_id();
3649 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
3651 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3652 kvm_arch_hardware_disable();
3655 static int kvm_dying_cpu(unsigned int cpu)
3657 raw_spin_lock(&kvm_count_lock);
3658 if (kvm_usage_count)
3659 hardware_disable_nolock(NULL);
3660 raw_spin_unlock(&kvm_count_lock);
3664 static void hardware_disable_all_nolock(void)
3666 BUG_ON(!kvm_usage_count);
3669 if (!kvm_usage_count)
3670 on_each_cpu(hardware_disable_nolock, NULL, 1);
3673 static void hardware_disable_all(void)
3675 raw_spin_lock(&kvm_count_lock);
3676 hardware_disable_all_nolock();
3677 raw_spin_unlock(&kvm_count_lock);
3680 static int hardware_enable_all(void)
3684 raw_spin_lock(&kvm_count_lock);
3687 if (kvm_usage_count == 1) {
3688 atomic_set(&hardware_enable_failed, 0);
3689 on_each_cpu(hardware_enable_nolock, NULL, 1);
3691 if (atomic_read(&hardware_enable_failed)) {
3692 hardware_disable_all_nolock();
3697 raw_spin_unlock(&kvm_count_lock);
3702 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3706 * Some (well, at least mine) BIOSes hang on reboot if
3709 * And Intel TXT required VMX off for all cpu when system shutdown.
3711 pr_info("kvm: exiting hardware virtualization\n");
3712 kvm_rebooting = true;
3713 on_each_cpu(hardware_disable_nolock, NULL, 1);
3717 static struct notifier_block kvm_reboot_notifier = {
3718 .notifier_call = kvm_reboot,
3722 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3726 for (i = 0; i < bus->dev_count; i++) {
3727 struct kvm_io_device *pos = bus->range[i].dev;
3729 kvm_iodevice_destructor(pos);
3734 static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1,
3735 const struct kvm_io_range *r2)
3737 gpa_t addr1 = r1->addr;
3738 gpa_t addr2 = r2->addr;
3743 /* If r2->len == 0, match the exact address. If r2->len != 0,
3744 * accept any overlapping write. Any order is acceptable for
3745 * overlapping ranges, because kvm_io_bus_get_first_dev ensures
3746 * we process all of them.
3759 static int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
3761 return kvm_io_bus_cmp(p1, p2);
3764 static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
3765 gpa_t addr, int len)
3767 struct kvm_io_range *range, key;
3770 key = (struct kvm_io_range) {
3775 range = bsearch(&key, bus->range, bus->dev_count,
3776 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
3780 off = range - bus->range;
3782 while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0)
3788 static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3789 struct kvm_io_range *range, const void *val)
3793 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3797 while (idx < bus->dev_count &&
3798 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3799 if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr,
3808 /* kvm_io_bus_write - called under kvm->slots_lock */
3809 int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3810 int len, const void *val)
3812 struct kvm_io_bus *bus;
3813 struct kvm_io_range range;
3816 range = (struct kvm_io_range) {
3821 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3824 r = __kvm_io_bus_write(vcpu, bus, &range, val);
3825 return r < 0 ? r : 0;
3827 EXPORT_SYMBOL_GPL(kvm_io_bus_write);
3829 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3830 int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
3831 gpa_t addr, int len, const void *val, long cookie)
3833 struct kvm_io_bus *bus;
3834 struct kvm_io_range range;
3836 range = (struct kvm_io_range) {
3841 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3845 /* First try the device referenced by cookie. */
3846 if ((cookie >= 0) && (cookie < bus->dev_count) &&
3847 (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0))
3848 if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len,
3853 * cookie contained garbage; fall back to search and return the
3854 * correct cookie value.
3856 return __kvm_io_bus_write(vcpu, bus, &range, val);
3859 static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3860 struct kvm_io_range *range, void *val)
3864 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3868 while (idx < bus->dev_count &&
3869 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3870 if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr,
3879 /* kvm_io_bus_read - called under kvm->slots_lock */
3880 int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3883 struct kvm_io_bus *bus;
3884 struct kvm_io_range range;
3887 range = (struct kvm_io_range) {
3892 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3895 r = __kvm_io_bus_read(vcpu, bus, &range, val);
3896 return r < 0 ? r : 0;
3899 /* Caller must hold slots_lock. */
3900 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
3901 int len, struct kvm_io_device *dev)
3904 struct kvm_io_bus *new_bus, *bus;
3905 struct kvm_io_range range;
3907 bus = kvm_get_bus(kvm, bus_idx);
3911 /* exclude ioeventfd which is limited by maximum fd */
3912 if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1)
3915 new_bus = kmalloc(struct_size(bus, range, bus->dev_count + 1),
3916 GFP_KERNEL_ACCOUNT);
3920 range = (struct kvm_io_range) {
3926 for (i = 0; i < bus->dev_count; i++)
3927 if (kvm_io_bus_cmp(&bus->range[i], &range) > 0)
3930 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
3931 new_bus->dev_count++;
3932 new_bus->range[i] = range;
3933 memcpy(new_bus->range + i + 1, bus->range + i,
3934 (bus->dev_count - i) * sizeof(struct kvm_io_range));
3935 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3936 synchronize_srcu_expedited(&kvm->srcu);
3942 /* Caller must hold slots_lock. */
3943 void kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3944 struct kvm_io_device *dev)
3947 struct kvm_io_bus *new_bus, *bus;
3949 bus = kvm_get_bus(kvm, bus_idx);
3953 for (i = 0; i < bus->dev_count; i++)
3954 if (bus->range[i].dev == dev) {
3958 if (i == bus->dev_count)
3961 new_bus = kmalloc(struct_size(bus, range, bus->dev_count - 1),
3962 GFP_KERNEL_ACCOUNT);
3964 pr_err("kvm: failed to shrink bus, removing it completely\n");
3968 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
3969 new_bus->dev_count--;
3970 memcpy(new_bus->range + i, bus->range + i + 1,
3971 (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
3974 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3975 synchronize_srcu_expedited(&kvm->srcu);
3980 struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3983 struct kvm_io_bus *bus;
3984 int dev_idx, srcu_idx;
3985 struct kvm_io_device *iodev = NULL;
3987 srcu_idx = srcu_read_lock(&kvm->srcu);
3989 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
3993 dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1);
3997 iodev = bus->range[dev_idx].dev;
4000 srcu_read_unlock(&kvm->srcu, srcu_idx);
4004 EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev);
4006 static int kvm_debugfs_open(struct inode *inode, struct file *file,
4007 int (*get)(void *, u64 *), int (*set)(void *, u64),
4010 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
4013 /* The debugfs files are a reference to the kvm struct which
4014 * is still valid when kvm_destroy_vm is called.
4015 * To avoid the race between open and the removal of the debugfs
4016 * directory we test against the users count.
4018 if (!refcount_inc_not_zero(&stat_data->kvm->users_count))
4021 if (simple_attr_open(inode, file, get,
4022 stat_data->mode & S_IWUGO ? set : NULL,
4024 kvm_put_kvm(stat_data->kvm);
4031 static int kvm_debugfs_release(struct inode *inode, struct file *file)
4033 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
4036 simple_attr_release(inode, file);
4037 kvm_put_kvm(stat_data->kvm);
4042 static int vm_stat_get_per_vm(void *data, u64 *val)
4044 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
4046 *val = *(ulong *)((void *)stat_data->kvm + stat_data->offset);
4051 static int vm_stat_clear_per_vm(void *data, u64 val)
4053 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
4058 *(ulong *)((void *)stat_data->kvm + stat_data->offset) = 0;
4063 static int vm_stat_get_per_vm_open(struct inode *inode, struct file *file)
4065 __simple_attr_check_format("%llu\n", 0ull);
4066 return kvm_debugfs_open(inode, file, vm_stat_get_per_vm,
4067 vm_stat_clear_per_vm, "%llu\n");
4070 static const struct file_operations vm_stat_get_per_vm_fops = {
4071 .owner = THIS_MODULE,
4072 .open = vm_stat_get_per_vm_open,
4073 .release = kvm_debugfs_release,
4074 .read = simple_attr_read,
4075 .write = simple_attr_write,
4076 .llseek = no_llseek,
4079 static int vcpu_stat_get_per_vm(void *data, u64 *val)
4082 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
4083 struct kvm_vcpu *vcpu;
4087 kvm_for_each_vcpu(i, vcpu, stat_data->kvm)
4088 *val += *(u64 *)((void *)vcpu + stat_data->offset);
4093 static int vcpu_stat_clear_per_vm(void *data, u64 val)
4096 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
4097 struct kvm_vcpu *vcpu;
4102 kvm_for_each_vcpu(i, vcpu, stat_data->kvm)
4103 *(u64 *)((void *)vcpu + stat_data->offset) = 0;
4108 static int vcpu_stat_get_per_vm_open(struct inode *inode, struct file *file)
4110 __simple_attr_check_format("%llu\n", 0ull);
4111 return kvm_debugfs_open(inode, file, vcpu_stat_get_per_vm,
4112 vcpu_stat_clear_per_vm, "%llu\n");
4115 static const struct file_operations vcpu_stat_get_per_vm_fops = {
4116 .owner = THIS_MODULE,
4117 .open = vcpu_stat_get_per_vm_open,
4118 .release = kvm_debugfs_release,
4119 .read = simple_attr_read,
4120 .write = simple_attr_write,
4121 .llseek = no_llseek,
4124 static const struct file_operations *stat_fops_per_vm[] = {
4125 [KVM_STAT_VCPU] = &vcpu_stat_get_per_vm_fops,
4126 [KVM_STAT_VM] = &vm_stat_get_per_vm_fops,
4129 static int vm_stat_get(void *_offset, u64 *val)
4131 unsigned offset = (long)_offset;
4133 struct kvm_stat_data stat_tmp = {.offset = offset};
4137 mutex_lock(&kvm_lock);
4138 list_for_each_entry(kvm, &vm_list, vm_list) {
4140 vm_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
4143 mutex_unlock(&kvm_lock);
4147 static int vm_stat_clear(void *_offset, u64 val)
4149 unsigned offset = (long)_offset;
4151 struct kvm_stat_data stat_tmp = {.offset = offset};
4156 mutex_lock(&kvm_lock);
4157 list_for_each_entry(kvm, &vm_list, vm_list) {
4159 vm_stat_clear_per_vm((void *)&stat_tmp, 0);
4161 mutex_unlock(&kvm_lock);
4166 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, vm_stat_clear, "%llu\n");
4168 static int vcpu_stat_get(void *_offset, u64 *val)
4170 unsigned offset = (long)_offset;
4172 struct kvm_stat_data stat_tmp = {.offset = offset};
4176 mutex_lock(&kvm_lock);
4177 list_for_each_entry(kvm, &vm_list, vm_list) {
4179 vcpu_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
4182 mutex_unlock(&kvm_lock);
4186 static int vcpu_stat_clear(void *_offset, u64 val)
4188 unsigned offset = (long)_offset;
4190 struct kvm_stat_data stat_tmp = {.offset = offset};
4195 mutex_lock(&kvm_lock);
4196 list_for_each_entry(kvm, &vm_list, vm_list) {
4198 vcpu_stat_clear_per_vm((void *)&stat_tmp, 0);
4200 mutex_unlock(&kvm_lock);
4205 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, vcpu_stat_clear,
4208 static const struct file_operations *stat_fops[] = {
4209 [KVM_STAT_VCPU] = &vcpu_stat_fops,
4210 [KVM_STAT_VM] = &vm_stat_fops,
4213 static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
4215 struct kobj_uevent_env *env;
4216 unsigned long long created, active;
4218 if (!kvm_dev.this_device || !kvm)
4221 mutex_lock(&kvm_lock);
4222 if (type == KVM_EVENT_CREATE_VM) {
4223 kvm_createvm_count++;
4225 } else if (type == KVM_EVENT_DESTROY_VM) {
4228 created = kvm_createvm_count;
4229 active = kvm_active_vms;
4230 mutex_unlock(&kvm_lock);
4232 env = kzalloc(sizeof(*env), GFP_KERNEL_ACCOUNT);
4236 add_uevent_var(env, "CREATED=%llu", created);
4237 add_uevent_var(env, "COUNT=%llu", active);
4239 if (type == KVM_EVENT_CREATE_VM) {
4240 add_uevent_var(env, "EVENT=create");
4241 kvm->userspace_pid = task_pid_nr(current);
4242 } else if (type == KVM_EVENT_DESTROY_VM) {
4243 add_uevent_var(env, "EVENT=destroy");
4245 add_uevent_var(env, "PID=%d", kvm->userspace_pid);
4247 if (!IS_ERR_OR_NULL(kvm->debugfs_dentry)) {
4248 char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL_ACCOUNT);
4251 tmp = dentry_path_raw(kvm->debugfs_dentry, p, PATH_MAX);
4253 add_uevent_var(env, "STATS_PATH=%s", tmp);
4257 /* no need for checks, since we are adding at most only 5 keys */
4258 env->envp[env->envp_idx++] = NULL;
4259 kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp);
4263 static void kvm_init_debug(void)
4265 struct kvm_stats_debugfs_item *p;
4267 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
4269 kvm_debugfs_num_entries = 0;
4270 for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) {
4271 int mode = p->mode ? p->mode : 0644;
4272 debugfs_create_file(p->name, mode, kvm_debugfs_dir,
4273 (void *)(long)p->offset,
4274 stat_fops[p->kind]);
4278 static int kvm_suspend(void)
4280 if (kvm_usage_count)
4281 hardware_disable_nolock(NULL);
4285 static void kvm_resume(void)
4287 if (kvm_usage_count) {
4288 #ifdef CONFIG_LOCKDEP
4289 WARN_ON(lockdep_is_held(&kvm_count_lock));
4291 hardware_enable_nolock(NULL);
4295 static struct syscore_ops kvm_syscore_ops = {
4296 .suspend = kvm_suspend,
4297 .resume = kvm_resume,
4301 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
4303 return container_of(pn, struct kvm_vcpu, preempt_notifier);
4306 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
4308 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
4310 WRITE_ONCE(vcpu->preempted, false);
4311 WRITE_ONCE(vcpu->ready, false);
4313 kvm_arch_sched_in(vcpu, cpu);
4315 kvm_arch_vcpu_load(vcpu, cpu);
4318 static void kvm_sched_out(struct preempt_notifier *pn,
4319 struct task_struct *next)
4321 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
4323 if (current->state == TASK_RUNNING) {
4324 WRITE_ONCE(vcpu->preempted, true);
4325 WRITE_ONCE(vcpu->ready, true);
4327 kvm_arch_vcpu_put(vcpu);
4330 static void check_processor_compat(void *rtn)
4332 *(int *)rtn = kvm_arch_check_processor_compat();
4335 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
4336 struct module *module)
4341 r = kvm_arch_init(opaque);
4346 * kvm_arch_init makes sure there's at most one caller
4347 * for architectures that support multiple implementations,
4348 * like intel and amd on x86.
4349 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
4350 * conflicts in case kvm is already setup for another implementation.
4352 r = kvm_irqfd_init();
4356 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
4361 r = kvm_arch_hardware_setup();
4365 for_each_online_cpu(cpu) {
4366 smp_call_function_single(cpu, check_processor_compat, &r, 1);
4371 r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "kvm/cpu:starting",
4372 kvm_starting_cpu, kvm_dying_cpu);
4375 register_reboot_notifier(&kvm_reboot_notifier);
4377 /* A kmem cache lets us meet the alignment requirements of fx_save. */
4379 vcpu_align = __alignof__(struct kvm_vcpu);
4381 kmem_cache_create_usercopy("kvm_vcpu", vcpu_size, vcpu_align,
4383 offsetof(struct kvm_vcpu, arch),
4384 sizeof_field(struct kvm_vcpu, arch),
4386 if (!kvm_vcpu_cache) {
4391 r = kvm_async_pf_init();
4395 kvm_chardev_ops.owner = module;
4396 kvm_vm_fops.owner = module;
4397 kvm_vcpu_fops.owner = module;
4399 r = misc_register(&kvm_dev);
4401 pr_err("kvm: misc device register failed\n");
4405 register_syscore_ops(&kvm_syscore_ops);
4407 kvm_preempt_ops.sched_in = kvm_sched_in;
4408 kvm_preempt_ops.sched_out = kvm_sched_out;
4412 r = kvm_vfio_ops_init();
4418 kvm_async_pf_deinit();
4420 kmem_cache_destroy(kvm_vcpu_cache);
4422 unregister_reboot_notifier(&kvm_reboot_notifier);
4423 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
4426 kvm_arch_hardware_unsetup();
4428 free_cpumask_var(cpus_hardware_enabled);
4436 EXPORT_SYMBOL_GPL(kvm_init);
4440 debugfs_remove_recursive(kvm_debugfs_dir);
4441 misc_deregister(&kvm_dev);
4442 kmem_cache_destroy(kvm_vcpu_cache);
4443 kvm_async_pf_deinit();
4444 unregister_syscore_ops(&kvm_syscore_ops);
4445 unregister_reboot_notifier(&kvm_reboot_notifier);
4446 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
4447 on_each_cpu(hardware_disable_nolock, NULL, 1);
4448 kvm_arch_hardware_unsetup();
4451 free_cpumask_var(cpus_hardware_enabled);
4452 kvm_vfio_ops_exit();
4454 EXPORT_SYMBOL_GPL(kvm_exit);
4456 struct kvm_vm_worker_thread_context {
4458 struct task_struct *parent;
4459 struct completion init_done;
4460 kvm_vm_thread_fn_t thread_fn;
4465 static int kvm_vm_worker_thread(void *context)
4468 * The init_context is allocated on the stack of the parent thread, so
4469 * we have to locally copy anything that is needed beyond initialization
4471 struct kvm_vm_worker_thread_context *init_context = context;
4472 struct kvm *kvm = init_context->kvm;
4473 kvm_vm_thread_fn_t thread_fn = init_context->thread_fn;
4474 uintptr_t data = init_context->data;
4477 err = kthread_park(current);
4478 /* kthread_park(current) is never supposed to return an error */
4483 err = cgroup_attach_task_all(init_context->parent, current);
4485 kvm_err("%s: cgroup_attach_task_all failed with err %d\n",
4490 set_user_nice(current, task_nice(init_context->parent));
4493 init_context->err = err;
4494 complete(&init_context->init_done);
4495 init_context = NULL;
4500 /* Wait to be woken up by the spawner before proceeding. */
4503 if (!kthread_should_stop())
4504 err = thread_fn(kvm, data);
4509 int kvm_vm_create_worker_thread(struct kvm *kvm, kvm_vm_thread_fn_t thread_fn,
4510 uintptr_t data, const char *name,
4511 struct task_struct **thread_ptr)
4513 struct kvm_vm_worker_thread_context init_context = {};
4514 struct task_struct *thread;
4517 init_context.kvm = kvm;
4518 init_context.parent = current;
4519 init_context.thread_fn = thread_fn;
4520 init_context.data = data;
4521 init_completion(&init_context.init_done);
4523 thread = kthread_run(kvm_vm_worker_thread, &init_context,
4524 "%s-%d", name, task_pid_nr(current));
4526 return PTR_ERR(thread);
4528 /* kthread_run is never supposed to return NULL */
4529 WARN_ON(thread == NULL);
4531 wait_for_completion(&init_context.init_done);
4533 if (!init_context.err)
4534 *thread_ptr = thread;
4536 return init_context.err;